They probably meant "whois privacy"[1] (without the space). Whois is basically a way to get information about a domain name (and many other stuff).
Whois privacy just ensures that your address, name and other stuff is not public.
They were probably joking when they asked that question.
Your reply doesn't seem sarcastic, so I take it you genuinely r/whoosh'ed (that's a reference to a subreddit about situations where someone is acting clueless).
I know ;) Some people still value an explanation though.
Realistically, I don't think HN is the place for those kinds of jokes, which are best kept for reddit/twitter.
Yeah I'm increasingly seeing these reddit-style low effort jokes on here, hopefully it's transient as folks acclimatize to the culture and customs here.